Magneto contact



Aug. 25, 1925 1,551,224

W. B. STOCKMAN MAGNETO CONTACT iled Oct. 21, 1922 mum-- V 1 3 man 1' ozPatented Aug. 1925.

UNITED STATES PATENT OFFICE.

IVATSON B. STOCKMAN, OF CHESTER, PENNSYLVANIA, ASSIGNOR OF ONE-HALF '10BENJAMIN SAMUEL MORTON, OF CHESTER, PENNSYLVANIA.

MAGNETO CONTACT.

Application filed October 21, 1922. Serial No. 596,013.

To all whom it may concern:

Be it known that I, VVATsoN B. STOCK- MAN, citizen of the United States,residing at Chester, in the county of Delaware and State ofPennsylvania, have invented certain new and .useful Improvements inMagneto Contacts, of which the following is a specification.

This invention relates to an improved magneto contact for Ford motorsand seeks,

tion of the vehicle engine while, when found necessary, the post may beremoved and cleaned individually.

A further object of the invention is to provide a device wherein thepost will be double-ended so that in replacing the post no care need beexercised regarding which end of the post is inserted in the shell ofthe contact, the double-ended feature of the post also tending, ofcourse, to prolong the usefulness of the post.

And the invention has as a still further object to provide a devicewhich will be particularly simple in its construction and mayaccordingly be produced at moderate cost and which may be applied to theengines of Ford motor vehicles without the necessity for any changetherein.-

Other and incidental objects will appear hereinafter.

In the drawings:

Figure 1 is an elevation showing my improvide magneto contact applied,

Figure 2 is a vertical sectional view through the device, V

Figure 3 is a transverse sectional View on the line 3-3 of Figure 1,looking in the direction of the arrows,

Figure 4 is a detail perspective view showing the retaining cap for thecontact post of the device,

.per end of the ,post;

Figure 5 is a detail perspective view showing a slightly modified formof cap,

Figure 6 is a detail sectional view show ing a further modified form ofcap, and

Figure 7 is a fragmentary elevation showing a modified structure.

In carrying the invention into effect, I

employ a base member or bushing 10 of suitable insulating material. Thisbase member is, as shown in Figure 1, adapted to fit through the usualmagneto contact opening in the transmission case of a Ford engine, thetransmission case being conventionally illustrated at 11, and isprovided with an annular flange 12 apertured to receive the usual capscrews detachably securing the device in position. The usual magnetoterminal of the engine is indicated at 13. Fixed upon the base member isa shell 14 having a reduced lower end portion 15 tightly fitting in thebase member and defining an internal annular shoulder 16 within theshell. Formed in the shell at one side thereof is a longitudinallydirected slot I 17 while near its upper endthe shell is provided withbayonet'slots 18. Removably fitting through the shell to engage theterminal 13 of the magneto is a contact post 19 provided at a pointsubstantially midway between its ends with an annular shoulder 20 toengage the shoulder 16 of the shell. As best brought out in Figure 2,the post is double-ended, being provided at each end with asubstantially hemi-spherical cavity 21 from the bottom .of which leads abore 22 extending axially of the post and intersecting said bore is atransverse opening 23 through the post. Opening through the wall of thecavity at opposite sides thereof are diametrically disposed notches 24.As shown in Figure 3, the slot 17 of the shell is of a width to freelyreceive the usual connector 25 at theadjacent end of the custom- .arymagneto lead wire 26 so that said connector may be freely slipped overthe upper end of the post to rest against the shoulder 20 thereof andsurrounding thepost to bear against said connector is a spring 27.Detachably engaged with the upper end of the shell is a flanged cap orcollar 28 freely received within the shell to surround the up- As shownin detail in Figure 4, this cap is provided with studs 29 to engage inthe bayonet slots 18 of the shell connecting the cap with the shell toengage the upper end of the spring 27 compressing the spring. Thus, thespring will not only serve to hold the connector in binding contact withthe shoulder 20 but will also serve to hold the post 19 in bindingcontact with the terminal 13 of the magneto.

Attention is now directed to the fact that the cavities 21 define knifeedges at the ends of the contact post so that by inserting a suitablepin in that one of the openings 23 exposed at the upper end of the post,the post may be oscillated for turning the knife edge at the lower endof the post against the terminal 13 of the magneto. Accordingly, anylint or other foreign matter collected about the lower end of the postmay be readily cut through to provide a clean metal contact between thepost and said terminal. Any foreign substance entering the cavity of thepost at the terminal 13 will tend to discharge from said cavity throughthe notches 24L of the cavity or may rise through the bore- 22 leadingupwardly from the cavity, to discharge through the adjacent opening 23at the lower end of the post. Ac cordingly, as will be seen, provisionis made whereby efficient electrical contact between the post andterminal of the magneto may be easily maintained without the necessityfor removing the contact post. However, should this be found necessary,the post may be readily displaced by detaching the collar 28, when thepost may be lifted through the shell 14: and cleaned individually. Thisfeature of the device also provides a convenient means whereby theunauthorized use of a vehicle equipped with the device may be easilyprevented since, upon leaving the vehicle, the contact post may beremoved for rendering the magneto of the vehicle inoperative and sincethe post is doubleended, no care need be exercised, in replacing thepost, as to which end thereof is first inserted through the shell.Furthermore, by making the post double-ended, the post may be reversedend for end should the knife edge at either end thereof become dulled.

In Figure 5 of the drawings, I have illustrated a slightly modified formof cap wherein the cap, indicated at 30, is spun and is provided withoppositely disposed studs 31 struck from the wall of the cap.

In Figure (3, I have illustrated a further modified form of cap,indicated at 32. In this modification, the cap is formed to surround theshell 14: and is provided with instruck studs 33 to engage in thebayonet slots 18 of the shell while at its upper end said cap isprovided with an apertnred end wall to receive the contact posttherethrough cooperating with the spring surrounding said post.

In Figure 7, I have illustrated a slight modification of the inventionwherein the shell of the device, indicated at 3%, is elon gated toupstand through the floor boards of the vehicle, the floor boards beingconventionally illustrated at 35. In such instance, the contact post ofthe device, indi cated at 36, is, of course, elongated to project at theupper end of the shell so that the post may be removed from the shellwithout the necessity for displacing the floor boards. Otherwise, thismodification is identical with the preferred construction and furtherdescription is accordingly believed unnecessary.

Having thus described the invention, what is claimed as new is:

1. A magneto contact including a base member, and a double-ended contactpost reversible end for end upon the base member.

2. A magneto contact including a base member, and a double-ended contactpost reversible end for end upon the base member and provided at one endwith an annular knife edge.

3. A magneto contact including a base member, a contact post carriedthereby, and yieldable means for pressing the post into engagement witha magneto terminal, and holding a circuit wire connector in bindingcontact with the post.

4:. A magneto contact including a base member having a shell thereon, acontact post extending through the shell and adapted to receive acircuit wire connector thereover, and yieldable means operativelycoacting between the post and shell bearing against said connector forholding the connector in binding contact with the post and pressing thepost into engagement with a magneto terminal.

5. A magneto contact including a base member having a shell thereonprovided with a slot, a contact post extending through the shell andprovided with a shoulder, said slot being adapted to accommodate acircuit wire connector extending into the shell to overlie saidshoulder, and yieldable means operatively coacting between the shell andpost pressing the connector into binding contact with the shoulder andholding the post in engagement with a magneto terminal.

6. In a magneto contact, a contact post provided at its lower end with acavity having a discharge passage leading upwardly therefrom to openthrough the side face of the post. p

7. In a magneto contact, a contact post provided at its lower end with acavity, the post being formed with a bore leading up wardly from saidcavity and being further formed with an opening leading from said borethrough the side face of the post.

8. In a magneto contact, a contact post provided at its lower end with acavity defining a knife edge at the adjacent terminal of the post, thepost being provided with a discharge notch leading from said cavity.

9. A magneto contact including a shell, and a contact post rotatablyfitting through said shell to project at'the ends thereof and loose withrespect to the shell whereby said post may be freely turned.

10. A magneto contact including a shell, a contact post rotatablyfitting through said shell to project at the ends thereof and loose withrespect to the shell whereby sald post may be freely turned andyieldable means operatively coacting between the shell and post forpressing the post in a direction inwardly through the shell.

WVATSON B. STOCKMAN. [1,. s]

